Monday, 13 June 2022
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Electric hoist is a kind of lifting equipment often used in production. Generally, it is suspended under the I-beam of a single-beam crane or used as a monorail crane to run under the I-beam track. Some customers may have I-beam track wear when using electric hoists, mainly due to wear on the side and tread of the I-beam. Today, I will briefly introduce the causes and solutions of electric hoist track wear.

The side wear of the I-beam track of the electric hoist:

The large wheel diameter deviation of the electric hoist causes the trolley to run skewed on the I-beam track.
The parallelism deviation of the driving wheel holes of the trolley is large, causing the unbalanced operation of the trolley.
The large deviation of the concentricity between the driving wheel and the passive wheel axle of the trolley causes the unsteady operation of the trolley.

If this kind of serious rail gnawing phenomenon occurs, the electric hoist trolley that meets the standard should be replaced first, and the trolley should be checked for stability and no swinging when it is installed.
Measure the damaged I-beam track. When the wear of the flange width is not more than 5% of the original size, repair is not required, but at this time, the lateral gap between the flange and the track must be re-adjusted according to the standard requirements. .
When the flange side wear is greater than 5% of the original size and less than 10mm, the method of repairing the reinforcement plate under the I-beam flange is used for repair.
Wear of I-beam tread of electric hoist:

Abrasion caused by long-term use.
Irregular use, such as oblique pulling or a reaction force in the running direction, causing the trolley to spin idly at a local position on the track.
When lifting a large load, if the trolley brake is adjusted too tightly, the trolley will slip when the workpiece shakes, which will cause track wear.
The rusty environment of outdoor operation will accelerate the wear of the track tread.

Check and measure the worn I-beam track. When the tread wear is less than 10% of the original size and no other damage is found, repairs are not required, but the cause of wear should be found out and supervision should be strengthened during use.
If the measured tread wear reaches or exceeds 10% of the original size, because the bearing capacity of the flange has not reached the original design bearing capacity, it needs to be repaired.
The lateral deformation of the I-beam of the electric hoist:

During use, due to the adjustment of the original small wheel rail clearance to be too large, the point of force exerted by the small wheel pressure on the I-steel rail is moved outward, causing the local bending moment of the I-steel flange to increase, and the stress reaches The degree of plastic deformation causes flange deformation.
Irregular small wheel sets and improper assembly adjustments will cause uneven wheel pressure, and a large wheel pressure will occur on a certain wheel, which will cause plastic deformation of the flange.
The operation of the crane truck causes the workpiece to shake, which causes the unilateral wheel to be stressed and the wheel pressure increases, which causes local plastic deformation of the flange.
Track tread wear caused by long-term use will reduce the local bearing capacity of the track and cause plastic deformation of the flange.

Heat symmetrically at the flange deformations on both sides of the track, and hammer correction while heating, or use special tools to correct the flange deformation. After rectification, follow the same method to deal with tread wear, and add welded reinforcement plates to the lower flanges.
There may be small waves on the tread during heating and correction, and necessary grinding should be carried out to ensure the smooth operation of the electric hoist trolley.
Due to the long heating range, the uniformity and symmetry of the heating are not easy to control. In order to prevent structural deformation, appropriate deformation control measures should be taken.
The wear and tear of the electric hoist I-beam track will affect the normal use of the equipment. If the wear is serious, it will also pose a threat to production safety. The staff should regularly check the operation of the electric hoist and repair it in time if the wear is found to avoid more serious consequences.
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